4 sheets crumpled up gives much greater surface area, as well as perpendicular folds, with which to grab the target material. Wiping with a flat surface makes n

4 sheets crumpled up gives much greater surface area, as well as perpendicular folds, with which to grab the target material. Wiping with a flat surface makes no sense at all, and likely requires multiple wipes to achieve the desired result. I wish there were statistics on the commonality of various wiping techniques.